Film with alignment film and optical device

Abstract

A film with alignment film which stably causes liquid crystal alignment and is excellent in adhesion between its constituting layers so as to give a high endurance and an excellent re-workability, and further to provide an optical device using the same. The film with alignment film contains at least a resin substrate and an alignment film, wherein the film is provided with a photocurable resin layer between the resin substrate and the alignment film, the photocurable resin layer being formed by use of a photo-cleaving type photopolymerization initiator. The optical device contains at least a resin substrate, an alignment film, and an optically functional layer, wherein the device is provided with a photocurable resin layer between the resin substrate and the alignment film, the photocurable resin layer being formed by use of a photo-cleaving type photopolymerization initiator.

1. A film with alignment film, comprising at least a resin substrate, and an alignment film, wherein the film is provided with a photocurable resin layer between the resin substrate and the alignment film, the photocurable resin layer being formed by use of a photo-cleaving type photopolymerization initiator. 
     
     
       2. The film with alignment film according to  claim 1 , wherein the alignment film includes a photo-alignment material which is irradiated with polarized ultraviolet rays so as to gain alignment performance. 
     
     
       3. The film with alignment film according to  claim 1 , wherein the photo-cleaving type photopolymerization initiator is one or more selected from the group consisting of acetophenone derivatives, phosphine oxide derivatives, bisimidazole derivatives, and titanocene derivatives. 
     
     
       4. The film with alignment film according to  claim 1 , wherein the resin substrate is a cellulose-based polymer. 
     
     
       5. The film with alignment film according to  claim 1 , wherein the photocurable resin layer is a layer obtained by curing a layer containing at least a photopolymerizable compound and a photo-cleaving type photopolymerization initiator by irradiation with light, and the photopolymerizable compound is a polyfunctional monomer and/or oligomer having in the molecule thereof two or more ethylenically unsaturated bonds. 
     
     
       6. An optical device comprising at least a resin substrate, an alignment film, and an optically functional layer, wherein the device is provided with a photocurable resin layer between the resin substrate and the alignment film, the photocurable resin layer being formed by use of a photo-cleaving type photopolymerization initiator. 
     
     
       7. The optical device according to  claim 6 , wherein the alignment film includes a photo-alignment material which is irradiated with polarized ultraviolet rays so as to gain alignment performance. 
     
     
       8. The optical device according to  claim 6 , wherein the photo-cleaving type photopolymerization initiator is one or more selected from the group consisting of acetophenone derivatives, phosphine oxide derivatives, bisimidazole derivatives, and titanocene derivatives. 
     
     
       9. The optical device according to  claim 6 , wherein the resin substrate is a cellulose-based polymer. 
     
     
       10. The film with alignment film according to  claim 6 , wherein the photocurable resin layer is a layer obtained by curing a layer containing at least a photopolymerizable compound and a photo-cleaving type photopolymerization initiator by irradiation with light, and the photopolymerizable compound is a polyfunctional monomer and/or oligomer having in the molecule thereof two or more ethylenically unsaturated bonds.